package wwj;

import java.text.DecimalFormat;
import java.util.List;
import java.io.IOException;
import java.util.StringTokenizer;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.DoubleWritable;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

import wwj.reader.TabReader;

/*
 * hadoop jar /home/hadoop/桌面/boot.jar RecommendParse3  /work/output/RecommendParse2/3/part-r-00000 /work/output/RecommendParse3/1
 */
public class RecommendParse3 {

	public static class MMapper extends
			Mapper<Object, Text, DoubleWritable, Text> {

		public void map(Object key, Text value, Context context)
				throws IOException, InterruptedException {
			List<String> list = TabReader
					.readLine(value.toString());
			 context.write(new DoubleWritable(Double.parseDouble(list.get(0))),new Text(list.get(1)));

		}
	}

	public static class MReducer extends
			Reducer<DoubleWritable, Text, Text,DoubleWritable> {
		 
		public void reduce(DoubleWritable key, Iterable<Text> values,
				Context context) throws IOException,
				InterruptedException {
			 
			for (Text val : values) {
				context.write(val,key);
			}
			 
			
		}
	}

	 

	public static void main(String[] args) throws Exception {
		Configuration conf = new Configuration();
		String[] otherArgs = args;
		if (otherArgs.length < 2) {
			System.err.println("Usage:  <in> [<in>...] <out>");
			System.exit(2);
		}
		Job job = new Job(conf, "rank avg");
		job.setJarByClass(RecommendParse3.class);
		job.setSortComparatorClass(NumberCmp.class);
		
		job.setMapperClass(MMapper.class);
		
		job.setReducerClass(MReducer.class);
		job.setMapOutputKeyClass(DoubleWritable.class);
		job.setMapOutputValueClass(Text.class);
		job.setOutputValueClass(DoubleWritable.class);
		job.setOutputKeyClass(Text.class);
		for (int i = 0; i < otherArgs.length - 1; ++i) {
			FileInputFormat.addInputPath(job,
					new Path(otherArgs[i]));
		}
		FileOutputFormat.setOutputPath(job, new Path(
				otherArgs[otherArgs.length - 1]));
		System.exit(job.waitForCompletion(true) ? 0 : 1);
	}
}
